IIA Institutional Repository

Browsing IIAP Publications by Subject "Astrophysical Turbulence"

Browsing IIAP Publications by Subject "Astrophysical Turbulence"

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  • Alpha effect in partially ionized plasmas 
    Krishan, V; Gangadhara, R. T (Springer Netherlands, 2008)
    There are several astrophysical situations where one needs to study the dynamics of magnetic flux in partially ionized turbulent plasmas. In a partially ionized plasma the magnetic induction is subjected to the ambipolar ...
  • Constraints on dynamo action 
    Mangalam, A (Springer Netherlands, 2008)
    We discuss first geometrical constraints on dynamo action. Magnetic field decay is unavoidable under certain conditions of symmetry. These known results are encompassed by a calculation for flows described in terms of a ...
  • Hybrid viscosity and magnetoviscous instability in hot, collisionless accretion disks 
    Subramanian, P; Becker, P. A; Kafatos, M. (Springer Netherlands, 2008)
    We aim to illustrate the role of hot protons in enhancing the magnetorotational instability (MRI) via the “hybrid” viscosity, which is due to the redirection of protons interacting with static magnetic field perturbations, ...
  • Magnetorotational instability in accretion disks 
    Krishan, V; Mahajan, S. M (Springer Netherlands, 2008)
    Accretion disks are a basic and an ubiquitous construct of nature. We describe their formation, briefly and qualitatively, in diverse astrophysical situations. These systems, though controlled by the gravitational forces, ...
  • Millisecond pulsar emission altitude from relativistic phase shift: PSR J0437-4715 
    Gangadhara, R. T; Thomas, R. M. C (Springer Netherlands, 2008)
    We have analyzed the profile of the millisecond pulsar PSR J0437-4715 at 1440 MHz by fitting the Gaussians to pulse components, and identified its 11 emission components. We propose that they form a emission beam with 5 ...
  • Nonlinear jeans instability in an uniformly rotating gas 
    Chakrabarti, N; Pal, B; Krishan, V (Springer Netherlands, 2008)
    A nonlinear stability analysis of a uniformly rotating gas in a gravitational field has been performed. One dimensional non-linear equations have been solved by the double-Lagrangian transformation method. An explosive ...
  • Planetary dynamos 
    Gaur, V. K (Springer Netherlands, 2008)
    The article begins with a reference to the first rational approaches to explaining the earth’s magnetic field notably Elsasser’s application of magneto-hydrodynamics, followed by brief outlines of the characteristics of ...
  • Polarization of coherent curvature radiation in pulsars 
    Thomas, R. M. C; Gangadhara, R. T (Springer Netherlands, 2008)
    We consider the coherent curvature radiation by relativistic plasma in pulsar magnetosphere. The radiation emitted by relativistic particle bunches is beamed in the direction of field line tangents. For the first time, we ...
  • Power spectra of the fluctuations in the solar wind 
    Krishan, V (Springer Netherlands, 2008)
    The power spectra of the velocity, the magnetic field and the density fluctuations and their inter-relationships are investigated in the turbulent solar wind using the dimensional approach of the Kolmogorovic type. While ...
  • Pulsar radio emission geometry 
    Gangadhara, R. T (Springer Netherlands, 2008)
    Pulsar radio emission is belived to come from relativistic plasma accelerated along the dipolar magnetic field lines in pulsar magnetosphere. The beamed emission by relativistic sources occur in the direction of tangents ...

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